#include <iostream>
#include <sys/types.h>
#include <sys/socket.h>
#include <cstdlib>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <strings.h>
#include <pthread.h>
using namespace std;

void Usage(std::string proc)
{
    std::cout<<"\n\rUsage: "<<proc<<"serverip serverport\n"<<std::endl;
}

struct ThreadData
{
    struct sockaddr_in server;
    int sockfd;
};

//多线程
void* recv_message(void* args)
{
    ThreadData *td = static_cast<ThreadData*>(args);
    char buffer[1024];
    while(true)
    {
        struct sockaddr_in tmp;
        socklen_t tmplen = sizeof(tmp);
        ssize_t s = recvfrom(td->sockfd,buffer,1023,0,(struct sockaddr*)&tmp,&tmplen);
        if(s > 0)
        {
            buffer[s] = 0;
            cout << buffer << endl;
        }
    }
}

void* send_message(void* args)
{
    ThreadData *td = static_cast<ThreadData*>(args);
    string message;
    socklen_t len = sizeof(td->server);
    while(true)
    {
        std::cout<<"please enter@";
        getline(cin,message);
        sendto(td->sockfd,message.c_str(),message.size(),0,(struct sockaddr*)&(td->server),len);
    }
}

//  ./udpclient serverip serverport
int main(int argc,char* argv[])
{
    if(argc!=3)
    {
        Usage(argv[0]);
        exit(0);
    }
    
    //从命令行获取服务器的ip和port
    std::string serverip = argv[1];
    uint16_t serverport = std::stoi(argv[2]);

    
    struct ThreadData td;
    bzero(&td.server,sizeof(td.server));
    td.server.sin_family = AF_INET;
    td.server.sin_port = htons(serverport);
    td.server.sin_addr.s_addr = inet_addr(serverip.c_str());
    

    //socket
    td.sockfd = socket(AF_INET,SOCK_DGRAM,0);
    if(td.sockfd<0)
    {
        std::cout<<"socker error"<<std::endl;
        return 1;
    }

    pthread_t recvr,sender;
    pthread_create(&recvr,nullptr,recv_message,&td);
    pthread_create(&sender,nullptr,send_message,&td);

    pthread_join(recvr,nullptr);
    pthread_join(sender,nullptr);

    close(td.sockfd);
    return 0;
}

